hi,
the migration process may be hang when you start another VM while the migration
is under way.
Eg.
Start a VM:
# xm create OVM_EL5U3_X86_PVHVM_4GB/vm.cfg
Wait for the VM bootup, then start another VM while this VM is migration:
# xm migrate -l OVM_EL5U3_X86_PVHVM_4GB localhost &
# xm create OVM_EL5U1_X86_HVM_4GB/vm.cfg
The migration will hang on:
# xm list
Name ID Mem VCPUs State Time(s)
Domain-0 0 543 2 r----- 110.1
OVM_EL5U1_X86_HVM_4GB 4 256 1 -b---- 39.6
OVM_EL5U3_X86_PVHVM_4GB 5 512 1 --p--- 0.0
The migration will only finish after shutting down VM OVM_EL5U1_X86_HVM_4GB.
This is because we are using a threaded model in xend, and the migration thread
is running
in the same context, and we are using pipes/sockets in migration.
So the write side of the pipe/socket created while migration will inherited to
children, thus
the reading side of the pipe/socket will hang if there is a child forked and
the child never end up
(like qemu-dm).
So we should close all inherited open file descriptors in every forked process.
Ian: please review the patch against qemu-dm forking.
Signed-off-by: Zhigang Wang <zhigang.x.wang@xxxxxxxxxx>
Reviewed-by: Xiaowei Hu <xiaowei.hu@xxxxxxxxxx>
thanks,
zhigang
diff -Nurap xen-unstable.orig/tools/python/xen/util/oshelp.py
xen-unstable/tools/python/xen/util/oshelp.py
--- xen-unstable.orig/tools/python/xen/util/oshelp.py 2009-07-24
16:07:59.000000000 +0800
+++ xen-unstable/tools/python/xen/util/oshelp.py 2009-07-24
16:52:32.000000000 +0800
@@ -1,6 +1,19 @@
import fcntl
import os
+def close_fds(pass_fds=()):
+ try:
+ MAXFD = os.sysconf('SC_OPEN_MAX')
+ except:
+ MAXFD = 256
+ for i in range(3, MAXFD):
+ if i in pass_fds:
+ continue
+ try:
+ os.close(i)
+ except OSError:
+ pass
+
def fcntl_setfd_cloexec(file, bool):
f = fcntl.fcntl(file, fcntl.F_GETFD)
if bool: f |= fcntl.FD_CLOEXEC
diff -Nurap xen-unstable.orig/tools/python/xen/util/xpopen.py
xen-unstable/tools/python/xen/util/xpopen.py
--- xen-unstable.orig/tools/python/xen/util/xpopen.py 2009-07-24
16:07:59.000000000 +0800
+++ xen-unstable/tools/python/xen/util/xpopen.py 2009-07-24
17:17:28.000000000 +0800
@@ -85,7 +85,7 @@ class xPopen3:
sts = -1 # Child not completed yet
- def __init__(self, cmd, capturestderr=False, bufsize=-1, passfd=()):
+ def __init__(self, cmd, capturestderr=False, bufsize=-1, passfd=(),
env=None):
"""The parameter 'cmd' is the shell command to execute in a
sub-process. The 'capturestderr' flag, if true, specifies that
the object should capture standard error output of the child process.
@@ -128,6 +128,10 @@ class xPopen3:
pass
try:
os.execvp(cmd[0], cmd)
+ if env is None:
+ os.execvp(cmd[0], cmd)
+ else:
+ os.execvpe(cmd[0], cmd, env)
finally:
os._exit(127)
@@ -154,16 +158,26 @@ class xPopen3:
return self.sts
-def xpopen2(cmd, bufsize=-1, mode='t', passfd=[]):
+def xpopen2(cmd, bufsize=-1, mode='t', passfd=[], env=None):
"""Execute the shell command 'cmd' in a sub-process. If 'bufsize' is
specified, it sets the buffer size for the I/O pipes. The file objects
(child_stdout, child_stdin) are returned."""
- inst = xPopen3(cmd, False, bufsize, passfd)
+ inst = xPopen3(cmd, False, bufsize, passfd, env)
return inst.fromchild, inst.tochild
-def xpopen3(cmd, bufsize=-1, mode='t', passfd=[]):
+def xpopen3(cmd, bufsize=-1, mode='t', passfd=[], env=None):
"""Execute the shell command 'cmd' in a sub-process. If 'bufsize' is
specified, it sets the buffer size for the I/O pipes. The file objects
(child_stdout, child_stdin, child_stderr) are returned."""
- inst = xPopen3(cmd, True, bufsize, passfd)
+ inst = xPopen3(cmd, True, bufsize, passfd, env)
return inst.fromchild, inst.tochild, inst.childerr
+
+def call(*popenargs, **kwargs):
+ """Run command with arguments. Wait for command to complete, then
+ return the status.
+
+ The arguments are the same as for the xPopen3 constructor. Example:
+
+ status = call("ls -l")
+ """
+ return xPopen3(*popenargs, **kwargs).wait()
diff -Nurap xen-unstable.orig/tools/python/xen/util/xsm/acm/acm.py
xen-unstable/tools/python/xen/util/xsm/acm/acm.py
--- xen-unstable.orig/tools/python/xen/util/xsm/acm/acm.py 2009-07-24
16:07:59.000000000 +0800
+++ xen-unstable/tools/python/xen/util/xsm/acm/acm.py 2009-07-24
17:27:30.000000000 +0800
@@ -31,7 +31,7 @@ from xen.xend import XendConstants
from xen.xend import XendOptions
from xen.xend.XendLogging import log
from xen.xend.XendError import VmError
-from xen.util import dictio, xsconstants, auxbin
+from xen.util import dictio, xsconstants, auxbin, xpopen
from xen.xend.XendConstants import *
#global directories and tools for security management
@@ -1710,7 +1710,7 @@ def run_resource_label_change_script(res
log.info("Running resource label change script %s: %s" %
(script, parms))
parms.update(os.environ)
- os.spawnve(os.P_WAIT, script[0], script, parms)
+ xpopen.call(" ".join(script, params))
else:
log.info("No script given for relabeling of resources.")
if not __script_runner:
diff -Nurap xen-unstable.orig/tools/python/xen/xend/image.py
xen-unstable/tools/python/xen/xend/image.py
--- xen-unstable.orig/tools/python/xen/xend/image.py 2009-07-24
16:07:59.000000000 +0800
+++ xen-unstable/tools/python/xen/xend/image.py 2009-07-27 17:37:20.000000000
+0800
@@ -438,9 +438,7 @@ class ImageHandler:
os.dup2(null, 0)
os.dup2(logfd, 1)
os.dup2(logfd, 2)
- os.close(null)
- os.close(logfd)
- self.sentinel_fifo.close()
+ oshelp.close_fds((sentinel_write.fileno(),))
try:
os.execve(self.device_model, args, env)
except Exception, e:
diff -Nurap xen-unstable.orig/tools/python/xen/xend/server/BlktapController.py
xen-unstable/tools/python/xen/xend/server/BlktapController.py
--- xen-unstable.orig/tools/python/xen/xend/server/BlktapController.py
2009-07-24 16:07:59.000000000 +0800
+++ xen-unstable/tools/python/xen/xend/server/BlktapController.py
2009-07-24 17:40:15.000000000 +0800
@@ -1,9 +1,9 @@
# Copyright (c) 2005, XenSource Ltd.
import string, re
-import popen2
from xen.xend.server.blkif import BlkifController
from xen.xend.XendLogging import log
+from xen.util.xpopen import xPopen3
phantomDev = 0;
phantomId = 0;
@@ -34,7 +34,7 @@ blktap_disk_types = blktap1_disk_types +
def doexec(args, inputtext=None):
"""Execute a subprocess, then return its return code, stdout and stderr"""
- proc = popen2.Popen3(args, True)
+ proc = xPopen3(args, True)
if inputtext != None:
proc.tochild.write(inputtext)
stdout = proc.fromchild
diff -Nurap xen-unstable.orig/tools/python/xen/xend/Vifctl.py
xen-unstable/tools/python/xen/xend/Vifctl.py
--- xen-unstable.orig/tools/python/xen/xend/Vifctl.py 2009-07-24
16:07:59.000000000 +0800
+++ xen-unstable/tools/python/xen/xend/Vifctl.py 2009-07-24
17:26:38.000000000 +0800
@@ -18,10 +18,9 @@
"""Xend interface to networking control scripts.
"""
-import os
import XendOptions
-
+from xen.util import xpopen
def network(op):
"""Call a network control script.
@@ -33,4 +32,4 @@ def network(op):
script = XendOptions.instance().get_network_script()
if script:
script.insert(1, op)
- os.spawnv(os.P_WAIT, script[0], script)
+ xpopen.call(script)
diff -Nurap xen-unstable.orig/tools/python/xen/xend/XendBootloader.py
xen-unstable/tools/python/xen/xend/XendBootloader.py
--- xen-unstable.orig/tools/python/xen/xend/XendBootloader.py 2009-07-24
16:07:59.000000000 +0800
+++ xen-unstable/tools/python/xen/xend/XendBootloader.py 2009-07-24
17:43:22.000000000 +0800
@@ -17,7 +17,7 @@ import random
import shlex
from xen.xend import sxp
-from xen.util import mkdir
+from xen.util import mkdir, oshelp
from XendLogging import log
from XendError import VmError
@@ -113,6 +113,7 @@ def bootloader(blexec, disk, dom, quiet
log.debug("Launching bootloader as %s." % str(args))
env = os.environ.copy()
env['TERM'] = 'vt100'
+ oshelp.close_fds()
os.execvpe(args[0], args, env)
except OSError, e:
print e
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